GraphView ContentDragger not working?

SetupZoom(ContentZoomer.DefaultMinScale, ContentZoomer.DefaultMaxScale); 
this.AddManipulator(new ContentDragger());
this.AddManipulator(new RectangleSelector());

some very simple setup codes for my graphview, the zooming and selecting is working fine, but I can’t drag my graphView (the background).

How could this be wrong? or maybe I misunderstood anthing?

Oh, solved. There’s nothing wrong but you need to hold alt to drag the view

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Holding down the middle mouse button also does the trick.